In Harry’s year, there were Hannah Abbott (marries Neville), Susan Bones (Amelia’s niece), Justin Finch-Fletchley (petrified in CoS), Ernie Macmillan (pompus), and Zacharias Smith (annoying git). None of them were highlighted as Cedric was, but they each had a small role in the plot.
I believe Tonks and Newt were also Hufflepuffs.
Meanwhile Ravenclaw had Cho Chang and… Uh… Hmm…
Luna?
Also Moaning Myrtle, Marietta Edgecombe (sneak), Terry Boot, Michael Corner (Ginny’s boyfriend), Padma Patil (Ron’s Yule Ball partner), Penelope Clearwater (Percy’s girlfriend), and Roger Davies (Fleur’s Yule Ball partner).
In terms of faculty, Flitwick, Trelawney, Quirrell, and Lockhart were Ravenclaws.
Luna didn’t get named until OotP iirc, in which Hufflepuff also gained another named character, Ernie Macmillan
I guess Newton doesn’t exist then.